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He said even the pages themselves are printed on dark red paper 'that gives you a headache to read', which prevents photocopying.

Hard to track down: The actor, who plays Luke Skywalker in the sci-fi saga, is currently in Prague where he is shooting the History Channel's Knightfall

While the un-photocopy-able paper was previously deployed for Episode VIII The Last Jedi, the temporary copies are new.

'They wound up letting me keep a script when we were doing [The Last Jedi], but I had to lock it up in a safe every night and then carry it with me and never let it out of my sight,' Hamill said. 'And I can understand why — if [a script] gets out it ruins it for everyone.'

Another issue of not being able to keep his own script is it messes with his method.

'I like to make notes, little cartoon drawings in the margins to help me visualize it… whatever you have to do to help remember it,' he revealed. 'You can't do that in electronic form, it's so impersonal. I'm old school and long for the days of paper scripts.'

Tales of keeping Star Wars plot points a secret are almost as old as the franchise itself; Darth Vader actor David Prowse was infamously fed fake lines before being overdubbed with the Sith Lord's lineage reveal in 1980's The Empire Strikes Back, while 1983's Return Of The Jedi was filmed under the project name Blue Harvest in an effort to prevent snooping.

Backwater planet: However this was not the case for the making of 1977's A New Hope, when no-one had ever heard of Star Wars

However this was not the case for the making of 1977's A New Hope, when no one had ever heard of Star Wars.

'I remember back when I read the first Star Wars [script], I was like, "Wow, that's the goofiest thing I've ever read",' Hamill recalled.

'I gave it to my best friend to read, and I said, "What do you think of it?" He said, "It's really wild, it's crazy, can I give it to Meredith?" "Sure, go ahead." It went around to all my friends.

'Of course back then nobody cared. Nowadays it's like working for some secret deep state government organization, like being in the CIA.'

The star revealed he has yet to film his scenes for the final chapter in the Skywalker saga; having become one with the Force at the climax of the last film, he will likely only appear as a Force ghost, or in flashbacks, or both.

He added: 'I still have to go over and do [Episode IX].... most of the parts I have coming up beside Star Wars are voice-over — there's one big one, very high profile, I can't announce now, that I'm really excited about. You know how it is these days, every time you sign NDAs.'

Who's your daddy? Tales of keeping Star Wars plot points a secret are almost as old as the franchise itself; Darth Vader actor David Prowse was infamously fed fake lines before being overdubbed with his lineage reveal in 1980's The Empire Strikes Back